CONTROLLING METHOD FOR SLUDGE FLOW IN GRANULATION OF SLUDGE GRAIN

摘要

PURPOSE:To keep the diameters of sludge grains and the quantity of granulation within fixed ranges by a method wherein a level of melted sludge in a flowing-down trough is controlled by the measuring signals of the temperature change of the melted sludge flowing down. CONSTITUTION:Melted sludge from a melted sludge ladle 1 is poured into one side of a trough 2 partitioned by means of a dash-board 7, passes under the dash-board 7 and flows to the other side. A level h of the melted sludge is continuously measured by means of a level gauge 8 mounted to an opening 4 of the bottom at the other side, and input to a controller 9. A melted sludge current 11 flowing down from the opening 4 collides with a backplate 3 at a falling point A, but the temperature of the falling melted sludge is continuously measured by means of a radiation thermometer 6 and the change signals are input to the controller 9. The level h is controlled by lifting and letting fall the dash-board 7 by the signals from the controller, and a dropping distance up to the backplate 3 is changed, thus altering the dimensions of sludge grains, which collide with the backplate 3, are dispersed and drop.